1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1a21f559582df34acd9f7585fad7d9bd3f6784156dc043d2f9345a11b2c910. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fcc2a77a-c1c2-4ce1-a593-0809b1711ef1.json and https://artists.proofprofile.net/proofs/artist/fcc2a77a-c1c2-4ce1-a593-0809b1711ef1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a73a0159c4d93c1467bdc5e7092e6d67eb96c95c4d035954a7f3022231399f7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DE1H12403014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b831476bddf10388834f2bc6ac65261848a99703b63855851405259759a6421. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DE1H12403015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa8c4cf8c484d0aa57bbb085c7c015e9d4551798dbeac021645f3eaeab0ae52c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DE1H12403016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1afa11ccc8bfaa545159e4940dbbc0205191fc385a5c4a2d4f7abc1a34c1e39. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DE1H12403017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc360ef1f7aadc83a3de30dd9394273111734c2d7482466b3e4824e101da5451. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAS2432088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01fb0ede0bed0695fdb727546aa3670691caceb11c8345c9c1f338ae9707839b. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAS2432089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36c9c32c7066517f3a0ed671c84b52ad63c10f8977507c0bd15f5f3e1d8c6cb7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAS2432090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28866bed606e8e01beaa79c3f30de4bc60451b8626bbb524ad802fa34d117755. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAS2432091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8885d5eb8c37e84d68038a88c78bfb5b37bd507812cb448d21fcaaef1e842229. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTAS2432092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc655de4bc786fb930a20be1a23d0dad966c111af78549de952b1d7e3521e9a33. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWU2485777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd34e5293d1520cde4fee83450789311606bbfcaf27bd8225e17c57d47174767b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWU2485778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29730c27a51d0f2799f0f9082623ea16c115b4ae3f9f518ee415f5959ec95d3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWU2485779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ae3315749ec3643b4d5b4ab50e4d517f0e011d37009b54bd9ecf2c1cdb45d3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWU2485780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d727bc62c515ded35bfe6ce1f1cca1c009c4da7b4a4f3c68ed5f3e48de6109. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWU2485781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cbf85fdaf77b5cd2ac4cef6293765f15e34fe05f1d4261720d6e49ae8e0e5bc. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHNB2425636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x850a9ff4dd1caa2505e95eb8007b36d0e40d4d269a7ea958f647b9e1cb16bd4b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFYY2490801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x568e54f0d0fa7b1b9ae65e169630ab52e63432dc1d782be01bc49531216c2eab. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFYY2489643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a1c8bf12a004d17a9ba1a8a9617ad42353d9f7346d116210d3c1e1a1c0ae988. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFYY2484787.